Heat and Mass Transfer
Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

RN = hl/k
RN = μ cp/k
RN = V²/t.cp
RN = ρ V l /μ

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Heat and Mass Transfer
A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer,

One could place either insulation on either side
The better insulation must be put outside
One should take into account the steam temperature before deciding as to which insulation is put where
The better insulation must be put inside

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